is substantially greater than that recoverable by bringing the vehicle from even the terminal speed to a complete stop. An example used by bicyclists is that during the descent of a hill, approximately three hair dryers' worth of power or some two horsepower is lost to Air drag at terminal speeds.

Regenerative and friction braking must both be used, creating the need to control them to produce the required total braking. The GM EV-1 was the first commercial car to do this. In 1997 and 1998,